Naked edge despite repair and also one floating in space

Hi,
V5
I had this item, (the one below the problem item) then chamfered edge 0.0375 the hook item on one side, trimmed and joined surfaces, and of course then its got a naked edge.

I remove the surface and use sweep2 to fill it, and still its there, also there is a magenta naked edge line floating in space.

How can I have a naked edge not even on the object ?

I am unable to see how I can solve this.
Naked Edge despite after sweep2.3dm (1.5 MB)

I am also unable to Mergeface for the triangle shaped surfaces at A and B.

why ?

Cheers

Steve

Hi Steve - if you loft across these pairs of edges, you should be fine

-Pascal